package com.app.util.common;

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

/**用户对移动端提交的数据（如：密码）进行加密
 * AES 是一种可逆加密算法，对用户的敏感信息加密处理 对原始数据进行AES加密后，在进行Base64编码转化；
 */
public class AESOperator {
    /*
     * 加密用的Key 可以用26个字母和数字组成 此处使用AES-128-CBC加密模式，key需要为16位。
     */
    private String sKey = "iholdsuncn502key";
    private String ivParameter = "ivparametersuncn";
    private static AESOperator instance = null;
    
    public AESOperator() {
	
    }
    
    public static AESOperator getInstance() {
	if (instance == null)
	    instance = new AESOperator();
	return instance;
    }
    
    //    public static String Encrypt(String encData, String secretKey, String vector) throws Exception {
    //	if (secretKey == null) {
    //	    return null;
    //	}
    //	if (secretKey.length() != 16) {
    //	    return null;
    //	}
    //	Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
    //	byte[] raw = secretKey.getBytes();
    //	SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
    //	IvParameterSpec iv = new IvParameterSpec(vector.getBytes());// ʹ��CBCģʽ����Ҫһ������iv�������Ӽ����㷨��ǿ��
    //	cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);
    //	byte[] encrypted = cipher.doFinal(encData.getBytes("utf-8"));
    //	return new BASE64Encoder().encode(encrypted);// �˴�ʹ��BASE64��ת�롣
    //    }
    
    // ����
    public String encrypt(String sSrc) throws Exception {
	Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
	byte[] raw = sKey.getBytes();
	SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
	IvParameterSpec iv = new IvParameterSpec(ivParameter.getBytes());// 使用CBC模式，需要一个向量iv，可增加加密算法的强度
	cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);
	byte[] encrypted = cipher.doFinal(sSrc.getBytes("utf-8"));
	return new BASE64Encoder().encode(encrypted);//此处使用BASE64做转码。
    }
    
    // ����
    public String decrypt(String sSrc) throws Exception {
	try {
	    byte[] raw = sKey.getBytes("ASCII");
	    SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
	    Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
	    IvParameterSpec iv = new IvParameterSpec(ivParameter.getBytes());
	    cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);
	    byte[] encrypted1 = new BASE64Decoder().decodeBuffer(sSrc);// 先用base64解密
	    byte[] original = cipher.doFinal(encrypted1);
	    String originalString = new String(original, "utf-8");
	    return originalString;
	} catch (Exception ex) {
	    return null;
	}
    }
    
    public static void main(String[] args) throws Exception {
	// 需要加密的字串
	String cSrc = "888888";
	
	//加密
	long lStart = System.currentTimeMillis();
	String enString = AESOperator.getInstance().encrypt(cSrc);
	System.out.println("加密后的字串是：" + enString);
	
	long lUseTime = System.currentTimeMillis() - lStart;
	System.out.println("加密耗时：" + lUseTime + "毫秒");
	// ����
	lStart = System.currentTimeMillis();
	String DeString = AESOperator.getInstance().decrypt(enString);
	System.out.println("解密后的字串是：" + DeString);
	lUseTime = System.currentTimeMillis() - lStart;
	System.out.println("解密耗时：" + lUseTime + "毫秒");
    }
    
}